Procccdinc^s of the Ohio State Acadciiiy of Science 145 



2. Some or all of the branches corky-winged, or twigs pul)erulent, self- 



pruned ; samara-faces pubescent. 3. 



3. Most of the branches with corky wing-like riJges: twigs glabrous 



or nearly so; leaves 1-3 in. long. {". alafa. 

 3. Branches often with corky wing-like ridges; twigs pubcrulent ; leaves 

 2-5 in. long. L'. raceiiwsa. 



1. Ulmus americana L. AA'l-ite Elm. A large tree of 

 rapid growth, with gray flaky bark, much cultivated in cities and 

 along roadsides. Samara ovate-oval, its faces glabrous. W^ood 

 lieavy, hard, flexible, and very tough ; used for wheel-hubs, sad- 

 dle-trees, rough cooperage and furniture, in boat and ship build- 

 ing, and in the construction of cars and wagons. Common on 

 blufifs and on the flood plains of rivers and creeks. Graceful in 

 form and very suitable for cultivation. Newf. to Man., Fla., 

 Tex., and Ohio. 



2. Ulmus racemosa Thom. Cork Elm. A large tree 

 with puberulent y^jvuig twigs, the branches or some of them with 

 corky wings. Samara oval, its margins densely ciliate. Wood 

 harder, stronger, and more durable than that of the White Elm. 

 In rich soil. Quebec to Ont., Mich., N. J., Tenn, Neb., and Ohio. 



* Ulmus CO III pest ris L. English Elm. A tree, rather py- 

 ramidal in shape, the twigs ascending, not drooping except in 

 "weeping" forms. Samara not ciliate, nearly or quite glabrous. 

 A good timber tree. Cultivated, from Europe. 



3. Ulmus alata Mx. Winged Elm. A small tree, 

 branches usually with corky wing-like ridges ; twigs glabrous or 

 nearly so. Samara oblong, pubescent on the faces. Wood very 

 compact ; used for wheel hubs. In dry or moist soil. Va. to 

 Fla., Ill, Ark., and Tex. 



4. Ulmus fulva Mx. Slippery Elm. A medium-sized 

 tree with rough grayish-brown fragrant bark and rough-pu- 

 bescent twigs. Samara oval-orbicular, pubescent over the seed. 

 Inner bark mucilaginous and medicinal. Wood hard and strong 

 but splitting easily when dry. Along streams, on flood plains and 

 on hills. Quebec to X. Dak., Fla., Tex., and Ohio. 



